Official instructions:
   To play you have to land the lander on one of the light blue landing pads. When landing you have to be perfectly level and touch down very gently. Land succesfully and you get half your fuel back.  You can change the gravity settings for more challenge.

   You have only the main rocket to change your speed or direction. Pressing the left and right arrow (cursor) keys spins the lander. You have to spin the lander till the main rocket is pointing in the direction you want and then press the space bar to fire the main rocket.

   When the game starts you are above one of the landing pads- but you are drifting to the right. To cancel your momentum spin the lander so the rocket is facing your direction of travel, then fire the rocket till you come to a stop. Gravity is pulling down on the lander constantly so you also need to occasionaly point the rocket down to slow your fall towards the landscape. By pointing the rocket at a angle you can change your horizontal speed and vertical speed at the same time.